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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef132322eddd4804a6b6fbe695a496fc531bcb3f767d91a1a81faadd9afcd25' 
  AND token = 'Z6Vj91JsaOlY453O2s0vRjUqY6Yzja1SvtbqwmT0k18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}